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Noctilucent clouds (NLCs), or night shining clouds, [1] are tenuous cloud-like phenomena in the upper atmosphere of Earth.When viewed from space, they are called polar mesospheric clouds (PMCs), detectable as a diffuse scattering layer of water ice crystals near the summer polar mesopause.
The source of the most valued jade, for example, is found in the Motagua River valley in eastern Guatemala, [11] and Olmec obsidian has been traced to sources in the Guatemala highlands, such as El Chayal and San Martín Jilotepeque, or in Puebla, [12] distances ranging from 200 to 400 km away (120 – 250 miles away) respectively.
Noctiluca scintillans is a marine species of dinoflagellate that can exist in a green or red form, depending on the pigmentation in its vacuoles.It can be found worldwide, but its geographical distribution varies depending on whether it is green or red.
A block of nephrite, a dark green mineral form of jade which is common in the region, and dressed into the form of a cube, about 27 inches (69 cm) per side and weighing about 2,200 pounds (1000 kg), [5] the Green Stone is supposed to have had some religious use or purpose, but what it may have been is unknown. [1]
Additional masks, jade tools, and ivory relics were also discovered in the pit. [24] The six pits were discovered at the Sanxingdui site between 2020 and 2022 during a renewed slate of excavations. The artifacts found in these excavations include fragments of a gold mask, traces of silk, bronze ware depicting animals, ivory carvings, and more.
Main jade producing countries. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments.Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]
Maya pendant in the Los Angeles County Museum of Art Map showing the locations of some of the main jade, obsidian and serpentine sources in Mesoamerica. The archaeological search for the Mesoamerican jade sources, which were largely lost at the time of the Maya collapse, began in 1799 when Alexander von Humboldt started his geological research in the New World.
The Māori word pounamu is derived from namu, an archaic word that describes blue-green (or 'grue') cognate with Tahitian ninamu. [2] Pounamu, also used in New Zealand English, in itself refers to two main types of green stone valued for carving: nephrite jade, classified by Māori as kawakawa, kahurangi, īnanga, and other names depending on colour; and translucent bowenite, a type of ...